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Subcritical crack growth and long-term strength in rock and cementitious material

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Title: Subcritical crack growth and long-term strength in rock and cementitious material
Authors: Nara, Yoshitaka Browse this author
Takada, Masafumi Browse this author
Mori, Daisuke Browse this author
Owada, Hitoshi Browse this author
Yoneda, Tetsuro Browse this author →KAKEN DB
Kaneko, Katsuhiko Browse this author →KAKEN DB
Keywords: Subcritical Crack Growth
Long-Term Strength
Double-Torsion Method
Andesite
High-Strength and Ultra Low-Permeability Concrete
Environmental Dependence
Issue Date: Jul-2010
Publisher: Springer Netherlands
Journal Title: International Journal of Fracture
Volume: 164
Issue: 1
Start Page: 57
End Page: 71
Publisher DOI: 10.1007/s10704-010-9455-z
Abstract: High-strength and ultra low-permeability concrete (HSULPC) is a strong candidate for a radioactive waste package containing transuranic radionuclides (TRU waste) for geological disposal. Knowledge of the time-dependent fracturing of HSULPC and surrounding rock mass is essential to assess the long-term stability of such underground repositories. We have measured crack velocity in andesite and HSULPC both in air and water to examine subcritical crack growth by the Double-Torsion method. In air, the crack velocity in andesite increased when the temperature and relative humidity increased. On the other hand, the temperature and relative humidity had little effect on the crack velocity in HSULPC in air. In water, the crack velocity increased when the temperature was higher for both andesite and HSULPC. Using these experimental results, the long-term strength was estimated. It was shown that the long-term strength of HSULPC was higher than that of andesite. In air, the long-term strength for andesite was affected by the temperature and relative humidity. The long-term strength for andesite decreased when the temperature or relative humidity increased. For HSULPC, the change of the long-term strength with varying temperature or relative humidity was smaller than andesite in air. In water, the long-term strength for both materials decreased with increasing the temperature. Comparing the long-term strength of andesite and HSULPC at the same environmental conditions, it was recognized that the decrease of the long-term strength of HSULPC is smaller than that of andesite. The long-term strength in water was smaller than that in air for both materials.
Rights: The final publication is available at www.springerlink.com
Type: article (author version)
URI: http://hdl.handle.net/2115/49666
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 金子 勝比古

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